Question 1
A medium-duty truck A/C system cools poorly. The technician finds the discharge air at the dash vents is only 15°F below ambient and the high-side pressure is normal. Which is the BEST first diagnostic step?
Correct Answer:
Verify refrigerant charge weight with a recovery/recharge machine
Question 2
Technician A says low airflow at the vents on a sleeper-cab truck can be caused by a clogged cabin air filter. Technician B says it can be caused by an evaporator iced over from a stuck-open expansion valve allowing too much refrigerant. Who is correct?
Correct Answer:
Both A and B
Question 3
During a performance test on a Class 8 truck A/C system at 1,500 rpm with doors open, the manifold gauges read 45 psi low side and 350 psi high side on R-134a with high ambient temperature. Vent temperature is high. What does this MOST likely indicate?
Correct Answer:
Overcharge or restricted condenser airflow
Question 4
A truck owner reports the A/C 'works on the highway but blows warm at idle.' Which condition BEST explains this symptom?
Correct Answer:
Inadequate condenser airflow at low engine/fan speed
Question 5
Before connecting a manifold gauge set or recovery machine to a truck A/C system, the technician must FIRST identify which refrigerant the system uses. What is the safest way to confirm whether the system is R-134a or R-1234yf?
Correct Answer:
Check the underhood refrigerant label and use a refrigerant identifier
Question 1
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Prepare with the ASE T7 HVAC (Medium Heavy Truck) Practice Questions - ASE T7 - Heating, Ventilation & Air Conditioning (Medium Heavy Truck) Certification Exam practice quiz. This question bank includes 100 questions covering truck, technician, compressor, refrigerant, and says. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ASE T7 HVAC (Medium Heavy Truck) Practice Questions - ASE T7 - Heating, Ventilation & Air Conditioning (Medium Heavy Truck) Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on truck, technician, compressor, refrigerant, and says. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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